1 /* 2 * PF_INET6 socket protocol family 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/af_inet.c 9 * 10 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #define pr_fmt(fmt) "IPv6: " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/kernel.h> 30 #include <linux/timer.h> 31 #include <linux/string.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/fcntl.h> 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/proc_fs.h> 38 #include <linux/stat.h> 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <linux/icmpv6.h> 45 #include <linux/netfilter_ipv6.h> 46 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/udp.h> 50 #include <net/udplite.h> 51 #include <net/tcp.h> 52 #include <net/ping.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/route.h> 56 #include <net/transp_v6.h> 57 #include <net/ip6_route.h> 58 #include <net/addrconf.h> 59 #include <net/ndisc.h> 60 #ifdef CONFIG_IPV6_TUNNEL 61 #include <net/ip6_tunnel.h> 62 #endif 63 64 #include <asm/uaccess.h> 65 #include <linux/mroute6.h> 66 67 MODULE_AUTHOR("Cast of dozens"); 68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 69 MODULE_LICENSE("GPL"); 70 71 /* The inetsw6 table contains everything that inet6_create needs to 72 * build a new socket. 73 */ 74 static struct list_head inetsw6[SOCK_MAX]; 75 static DEFINE_SPINLOCK(inetsw6_lock); 76 77 struct ipv6_params ipv6_defaults = { 78 .disable_ipv6 = 0, 79 .autoconf = 1, 80 }; 81 82 static int disable_ipv6_mod; 83 84 module_param_named(disable, disable_ipv6_mod, int, 0444); 85 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 86 87 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 88 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 89 90 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 91 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 92 93 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 94 { 95 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 96 97 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 98 } 99 100 static int inet6_create(struct net *net, struct socket *sock, int protocol, 101 int kern) 102 { 103 struct inet_sock *inet; 104 struct ipv6_pinfo *np; 105 struct sock *sk; 106 struct inet_protosw *answer; 107 struct proto *answer_prot; 108 unsigned char answer_flags; 109 int try_loading_module = 0; 110 int err; 111 112 /* Look for the requested type/protocol pair. */ 113 lookup_protocol: 114 err = -ESOCKTNOSUPPORT; 115 rcu_read_lock(); 116 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 117 118 err = 0; 119 /* Check the non-wild match. */ 120 if (protocol == answer->protocol) { 121 if (protocol != IPPROTO_IP) 122 break; 123 } else { 124 /* Check for the two wild cases. */ 125 if (IPPROTO_IP == protocol) { 126 protocol = answer->protocol; 127 break; 128 } 129 if (IPPROTO_IP == answer->protocol) 130 break; 131 } 132 err = -EPROTONOSUPPORT; 133 } 134 135 if (err) { 136 if (try_loading_module < 2) { 137 rcu_read_unlock(); 138 /* 139 * Be more specific, e.g. net-pf-10-proto-132-type-1 140 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 141 */ 142 if (++try_loading_module == 1) 143 request_module("net-pf-%d-proto-%d-type-%d", 144 PF_INET6, protocol, sock->type); 145 /* 146 * Fall back to generic, e.g. net-pf-10-proto-132 147 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 148 */ 149 else 150 request_module("net-pf-%d-proto-%d", 151 PF_INET6, protocol); 152 goto lookup_protocol; 153 } else 154 goto out_rcu_unlock; 155 } 156 157 err = -EPERM; 158 if (sock->type == SOCK_RAW && !kern && 159 !ns_capable(net->user_ns, CAP_NET_RAW)) 160 goto out_rcu_unlock; 161 162 sock->ops = answer->ops; 163 answer_prot = answer->prot; 164 answer_flags = answer->flags; 165 rcu_read_unlock(); 166 167 WARN_ON(!answer_prot->slab); 168 169 err = -ENOBUFS; 170 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 171 if (!sk) 172 goto out; 173 174 sock_init_data(sock, sk); 175 176 err = 0; 177 if (INET_PROTOSW_REUSE & answer_flags) 178 sk->sk_reuse = SK_CAN_REUSE; 179 180 inet = inet_sk(sk); 181 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 182 183 if (SOCK_RAW == sock->type) { 184 inet->inet_num = protocol; 185 if (IPPROTO_RAW == protocol) 186 inet->hdrincl = 1; 187 } 188 189 sk->sk_destruct = inet_sock_destruct; 190 sk->sk_family = PF_INET6; 191 sk->sk_protocol = protocol; 192 193 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 194 195 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 196 np->hop_limit = -1; 197 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 198 np->mc_loop = 1; 199 np->pmtudisc = IPV6_PMTUDISC_WANT; 200 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 201 202 /* Init the ipv4 part of the socket since we can have sockets 203 * using v6 API for ipv4. 204 */ 205 inet->uc_ttl = -1; 206 207 inet->mc_loop = 1; 208 inet->mc_ttl = 1; 209 inet->mc_index = 0; 210 inet->mc_list = NULL; 211 inet->rcv_tos = 0; 212 213 if (net->ipv4.sysctl_ip_no_pmtu_disc) 214 inet->pmtudisc = IP_PMTUDISC_DONT; 215 else 216 inet->pmtudisc = IP_PMTUDISC_WANT; 217 /* 218 * Increment only the relevant sk_prot->socks debug field, this changes 219 * the previous behaviour of incrementing both the equivalent to 220 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 221 * 222 * This allows better debug granularity as we'll know exactly how many 223 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 224 * transport protocol socks. -acme 225 */ 226 sk_refcnt_debug_inc(sk); 227 228 if (inet->inet_num) { 229 /* It assumes that any protocol which allows 230 * the user to assign a number at socket 231 * creation time automatically shares. 232 */ 233 inet->inet_sport = htons(inet->inet_num); 234 sk->sk_prot->hash(sk); 235 } 236 if (sk->sk_prot->init) { 237 err = sk->sk_prot->init(sk); 238 if (err) { 239 sk_common_release(sk); 240 goto out; 241 } 242 } 243 out: 244 return err; 245 out_rcu_unlock: 246 rcu_read_unlock(); 247 goto out; 248 } 249 250 251 /* bind for INET6 API */ 252 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 253 { 254 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 255 struct sock *sk = sock->sk; 256 struct inet_sock *inet = inet_sk(sk); 257 struct ipv6_pinfo *np = inet6_sk(sk); 258 struct net *net = sock_net(sk); 259 __be32 v4addr = 0; 260 unsigned short snum; 261 int addr_type = 0; 262 int err = 0; 263 264 /* If the socket has its own bind function then use it. */ 265 if (sk->sk_prot->bind) 266 return sk->sk_prot->bind(sk, uaddr, addr_len); 267 268 if (addr_len < SIN6_LEN_RFC2133) 269 return -EINVAL; 270 271 if (addr->sin6_family != AF_INET6) 272 return -EAFNOSUPPORT; 273 274 addr_type = ipv6_addr_type(&addr->sin6_addr); 275 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 276 return -EINVAL; 277 278 snum = ntohs(addr->sin6_port); 279 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 280 return -EACCES; 281 282 lock_sock(sk); 283 284 /* Check these errors (active socket, double bind). */ 285 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 286 err = -EINVAL; 287 goto out; 288 } 289 290 /* Check if the address belongs to the host. */ 291 if (addr_type == IPV6_ADDR_MAPPED) { 292 int chk_addr_ret; 293 294 /* Binding to v4-mapped address on a v6-only socket 295 * makes no sense 296 */ 297 if (sk->sk_ipv6only) { 298 err = -EINVAL; 299 goto out; 300 } 301 302 /* Reproduce AF_INET checks to make the bindings consistent */ 303 v4addr = addr->sin6_addr.s6_addr32[3]; 304 chk_addr_ret = inet_addr_type(net, v4addr); 305 if (!net->ipv4.sysctl_ip_nonlocal_bind && 306 !(inet->freebind || inet->transparent) && 307 v4addr != htonl(INADDR_ANY) && 308 chk_addr_ret != RTN_LOCAL && 309 chk_addr_ret != RTN_MULTICAST && 310 chk_addr_ret != RTN_BROADCAST) { 311 err = -EADDRNOTAVAIL; 312 goto out; 313 } 314 } else { 315 if (addr_type != IPV6_ADDR_ANY) { 316 struct net_device *dev = NULL; 317 318 rcu_read_lock(); 319 if (__ipv6_addr_needs_scope_id(addr_type)) { 320 if (addr_len >= sizeof(struct sockaddr_in6) && 321 addr->sin6_scope_id) { 322 /* Override any existing binding, if another one 323 * is supplied by user. 324 */ 325 sk->sk_bound_dev_if = addr->sin6_scope_id; 326 } 327 328 /* Binding to link-local address requires an interface */ 329 if (!sk->sk_bound_dev_if) { 330 err = -EINVAL; 331 goto out_unlock; 332 } 333 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 334 if (!dev) { 335 err = -ENODEV; 336 goto out_unlock; 337 } 338 } 339 340 /* ipv4 addr of the socket is invalid. Only the 341 * unspecified and mapped address have a v4 equivalent. 342 */ 343 v4addr = LOOPBACK4_IPV6; 344 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 345 if (!(inet->freebind || inet->transparent) && 346 !ipv6_chk_addr(net, &addr->sin6_addr, 347 dev, 0)) { 348 err = -EADDRNOTAVAIL; 349 goto out_unlock; 350 } 351 } 352 rcu_read_unlock(); 353 } 354 } 355 356 inet->inet_rcv_saddr = v4addr; 357 inet->inet_saddr = v4addr; 358 359 sk->sk_v6_rcv_saddr = addr->sin6_addr; 360 361 if (!(addr_type & IPV6_ADDR_MULTICAST)) 362 np->saddr = addr->sin6_addr; 363 364 /* Make sure we are allowed to bind here. */ 365 if ((snum || !inet->bind_address_no_port) && 366 sk->sk_prot->get_port(sk, snum)) { 367 inet_reset_saddr(sk); 368 err = -EADDRINUSE; 369 goto out; 370 } 371 372 if (addr_type != IPV6_ADDR_ANY) { 373 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 374 if (addr_type != IPV6_ADDR_MAPPED) 375 sk->sk_ipv6only = 1; 376 } 377 if (snum) 378 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 379 inet->inet_sport = htons(inet->inet_num); 380 inet->inet_dport = 0; 381 inet->inet_daddr = 0; 382 out: 383 release_sock(sk); 384 return err; 385 out_unlock: 386 rcu_read_unlock(); 387 goto out; 388 } 389 EXPORT_SYMBOL(inet6_bind); 390 391 int inet6_release(struct socket *sock) 392 { 393 struct sock *sk = sock->sk; 394 395 if (!sk) 396 return -EINVAL; 397 398 /* Free mc lists */ 399 ipv6_sock_mc_close(sk); 400 401 /* Free ac lists */ 402 ipv6_sock_ac_close(sk); 403 404 return inet_release(sock); 405 } 406 EXPORT_SYMBOL(inet6_release); 407 408 void inet6_destroy_sock(struct sock *sk) 409 { 410 struct ipv6_pinfo *np = inet6_sk(sk); 411 struct sk_buff *skb; 412 struct ipv6_txoptions *opt; 413 414 /* Release rx options */ 415 416 skb = xchg(&np->pktoptions, NULL); 417 if (skb) 418 kfree_skb(skb); 419 420 skb = xchg(&np->rxpmtu, NULL); 421 if (skb) 422 kfree_skb(skb); 423 424 /* Free flowlabels */ 425 fl6_free_socklist(sk); 426 427 /* Free tx options */ 428 429 opt = xchg(&np->opt, NULL); 430 if (opt) 431 sock_kfree_s(sk, opt, opt->tot_len); 432 } 433 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 434 435 /* 436 * This does both peername and sockname. 437 */ 438 439 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 440 int *uaddr_len, int peer) 441 { 442 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 443 struct sock *sk = sock->sk; 444 struct inet_sock *inet = inet_sk(sk); 445 struct ipv6_pinfo *np = inet6_sk(sk); 446 447 sin->sin6_family = AF_INET6; 448 sin->sin6_flowinfo = 0; 449 sin->sin6_scope_id = 0; 450 if (peer) { 451 if (!inet->inet_dport) 452 return -ENOTCONN; 453 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 454 peer == 1) 455 return -ENOTCONN; 456 sin->sin6_port = inet->inet_dport; 457 sin->sin6_addr = sk->sk_v6_daddr; 458 if (np->sndflow) 459 sin->sin6_flowinfo = np->flow_label; 460 } else { 461 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 462 sin->sin6_addr = np->saddr; 463 else 464 sin->sin6_addr = sk->sk_v6_rcv_saddr; 465 466 sin->sin6_port = inet->inet_sport; 467 } 468 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 469 sk->sk_bound_dev_if); 470 *uaddr_len = sizeof(*sin); 471 return 0; 472 } 473 EXPORT_SYMBOL(inet6_getname); 474 475 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 476 { 477 struct sock *sk = sock->sk; 478 struct net *net = sock_net(sk); 479 480 switch (cmd) { 481 case SIOCGSTAMP: 482 return sock_get_timestamp(sk, (struct timeval __user *)arg); 483 484 case SIOCGSTAMPNS: 485 return sock_get_timestampns(sk, (struct timespec __user *)arg); 486 487 case SIOCADDRT: 488 case SIOCDELRT: 489 490 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 491 492 case SIOCSIFADDR: 493 return addrconf_add_ifaddr(net, (void __user *) arg); 494 case SIOCDIFADDR: 495 return addrconf_del_ifaddr(net, (void __user *) arg); 496 case SIOCSIFDSTADDR: 497 return addrconf_set_dstaddr(net, (void __user *) arg); 498 default: 499 if (!sk->sk_prot->ioctl) 500 return -ENOIOCTLCMD; 501 return sk->sk_prot->ioctl(sk, cmd, arg); 502 } 503 /*NOTREACHED*/ 504 return 0; 505 } 506 EXPORT_SYMBOL(inet6_ioctl); 507 508 const struct proto_ops inet6_stream_ops = { 509 .family = PF_INET6, 510 .owner = THIS_MODULE, 511 .release = inet6_release, 512 .bind = inet6_bind, 513 .connect = inet_stream_connect, /* ok */ 514 .socketpair = sock_no_socketpair, /* a do nothing */ 515 .accept = inet_accept, /* ok */ 516 .getname = inet6_getname, 517 .poll = tcp_poll, /* ok */ 518 .ioctl = inet6_ioctl, /* must change */ 519 .listen = inet_listen, /* ok */ 520 .shutdown = inet_shutdown, /* ok */ 521 .setsockopt = sock_common_setsockopt, /* ok */ 522 .getsockopt = sock_common_getsockopt, /* ok */ 523 .sendmsg = inet_sendmsg, /* ok */ 524 .recvmsg = inet_recvmsg, /* ok */ 525 .mmap = sock_no_mmap, 526 .sendpage = inet_sendpage, 527 .splice_read = tcp_splice_read, 528 #ifdef CONFIG_COMPAT 529 .compat_setsockopt = compat_sock_common_setsockopt, 530 .compat_getsockopt = compat_sock_common_getsockopt, 531 #endif 532 }; 533 534 const struct proto_ops inet6_dgram_ops = { 535 .family = PF_INET6, 536 .owner = THIS_MODULE, 537 .release = inet6_release, 538 .bind = inet6_bind, 539 .connect = inet_dgram_connect, /* ok */ 540 .socketpair = sock_no_socketpair, /* a do nothing */ 541 .accept = sock_no_accept, /* a do nothing */ 542 .getname = inet6_getname, 543 .poll = udp_poll, /* ok */ 544 .ioctl = inet6_ioctl, /* must change */ 545 .listen = sock_no_listen, /* ok */ 546 .shutdown = inet_shutdown, /* ok */ 547 .setsockopt = sock_common_setsockopt, /* ok */ 548 .getsockopt = sock_common_getsockopt, /* ok */ 549 .sendmsg = inet_sendmsg, /* ok */ 550 .recvmsg = inet_recvmsg, /* ok */ 551 .mmap = sock_no_mmap, 552 .sendpage = sock_no_sendpage, 553 #ifdef CONFIG_COMPAT 554 .compat_setsockopt = compat_sock_common_setsockopt, 555 .compat_getsockopt = compat_sock_common_getsockopt, 556 #endif 557 }; 558 559 static const struct net_proto_family inet6_family_ops = { 560 .family = PF_INET6, 561 .create = inet6_create, 562 .owner = THIS_MODULE, 563 }; 564 565 int inet6_register_protosw(struct inet_protosw *p) 566 { 567 struct list_head *lh; 568 struct inet_protosw *answer; 569 struct list_head *last_perm; 570 int protocol = p->protocol; 571 int ret; 572 573 spin_lock_bh(&inetsw6_lock); 574 575 ret = -EINVAL; 576 if (p->type >= SOCK_MAX) 577 goto out_illegal; 578 579 /* If we are trying to override a permanent protocol, bail. */ 580 answer = NULL; 581 ret = -EPERM; 582 last_perm = &inetsw6[p->type]; 583 list_for_each(lh, &inetsw6[p->type]) { 584 answer = list_entry(lh, struct inet_protosw, list); 585 586 /* Check only the non-wild match. */ 587 if (INET_PROTOSW_PERMANENT & answer->flags) { 588 if (protocol == answer->protocol) 589 break; 590 last_perm = lh; 591 } 592 593 answer = NULL; 594 } 595 if (answer) 596 goto out_permanent; 597 598 /* Add the new entry after the last permanent entry if any, so that 599 * the new entry does not override a permanent entry when matched with 600 * a wild-card protocol. But it is allowed to override any existing 601 * non-permanent entry. This means that when we remove this entry, the 602 * system automatically returns to the old behavior. 603 */ 604 list_add_rcu(&p->list, last_perm); 605 ret = 0; 606 out: 607 spin_unlock_bh(&inetsw6_lock); 608 return ret; 609 610 out_permanent: 611 pr_err("Attempt to override permanent protocol %d\n", protocol); 612 goto out; 613 614 out_illegal: 615 pr_err("Ignoring attempt to register invalid socket type %d\n", 616 p->type); 617 goto out; 618 } 619 EXPORT_SYMBOL(inet6_register_protosw); 620 621 void 622 inet6_unregister_protosw(struct inet_protosw *p) 623 { 624 if (INET_PROTOSW_PERMANENT & p->flags) { 625 pr_err("Attempt to unregister permanent protocol %d\n", 626 p->protocol); 627 } else { 628 spin_lock_bh(&inetsw6_lock); 629 list_del_rcu(&p->list); 630 spin_unlock_bh(&inetsw6_lock); 631 632 synchronize_net(); 633 } 634 } 635 EXPORT_SYMBOL(inet6_unregister_protosw); 636 637 int inet6_sk_rebuild_header(struct sock *sk) 638 { 639 struct ipv6_pinfo *np = inet6_sk(sk); 640 struct dst_entry *dst; 641 642 dst = __sk_dst_check(sk, np->dst_cookie); 643 644 if (!dst) { 645 struct inet_sock *inet = inet_sk(sk); 646 struct in6_addr *final_p, final; 647 struct flowi6 fl6; 648 649 memset(&fl6, 0, sizeof(fl6)); 650 fl6.flowi6_proto = sk->sk_protocol; 651 fl6.daddr = sk->sk_v6_daddr; 652 fl6.saddr = np->saddr; 653 fl6.flowlabel = np->flow_label; 654 fl6.flowi6_oif = sk->sk_bound_dev_if; 655 fl6.flowi6_mark = sk->sk_mark; 656 fl6.fl6_dport = inet->inet_dport; 657 fl6.fl6_sport = inet->inet_sport; 658 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 659 660 final_p = fl6_update_dst(&fl6, np->opt, &final); 661 662 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 663 if (IS_ERR(dst)) { 664 sk->sk_route_caps = 0; 665 sk->sk_err_soft = -PTR_ERR(dst); 666 return PTR_ERR(dst); 667 } 668 669 __ip6_dst_store(sk, dst, NULL, NULL); 670 } 671 672 return 0; 673 } 674 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 675 676 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 677 const struct inet6_skb_parm *opt) 678 { 679 const struct ipv6_pinfo *np = inet6_sk(sk); 680 681 if (np->rxopt.all) { 682 if ((opt->hop && (np->rxopt.bits.hopopts || 683 np->rxopt.bits.ohopopts)) || 684 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 685 np->rxopt.bits.rxflow) || 686 (opt->srcrt && (np->rxopt.bits.srcrt || 687 np->rxopt.bits.osrcrt)) || 688 ((opt->dst1 || opt->dst0) && 689 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 690 return true; 691 } 692 return false; 693 } 694 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 695 696 static struct packet_type ipv6_packet_type __read_mostly = { 697 .type = cpu_to_be16(ETH_P_IPV6), 698 .func = ipv6_rcv, 699 }; 700 701 static int __init ipv6_packet_init(void) 702 { 703 dev_add_pack(&ipv6_packet_type); 704 return 0; 705 } 706 707 static void ipv6_packet_cleanup(void) 708 { 709 dev_remove_pack(&ipv6_packet_type); 710 } 711 712 static int __net_init ipv6_init_mibs(struct net *net) 713 { 714 int i; 715 716 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 717 if (!net->mib.udp_stats_in6) 718 return -ENOMEM; 719 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 720 if (!net->mib.udplite_stats_in6) 721 goto err_udplite_mib; 722 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 723 if (!net->mib.ipv6_statistics) 724 goto err_ip_mib; 725 726 for_each_possible_cpu(i) { 727 struct ipstats_mib *af_inet6_stats; 728 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 729 u64_stats_init(&af_inet6_stats->syncp); 730 } 731 732 733 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 734 if (!net->mib.icmpv6_statistics) 735 goto err_icmp_mib; 736 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 737 GFP_KERNEL); 738 if (!net->mib.icmpv6msg_statistics) 739 goto err_icmpmsg_mib; 740 return 0; 741 742 err_icmpmsg_mib: 743 free_percpu(net->mib.icmpv6_statistics); 744 err_icmp_mib: 745 free_percpu(net->mib.ipv6_statistics); 746 err_ip_mib: 747 free_percpu(net->mib.udplite_stats_in6); 748 err_udplite_mib: 749 free_percpu(net->mib.udp_stats_in6); 750 return -ENOMEM; 751 } 752 753 static void ipv6_cleanup_mibs(struct net *net) 754 { 755 free_percpu(net->mib.udp_stats_in6); 756 free_percpu(net->mib.udplite_stats_in6); 757 free_percpu(net->mib.ipv6_statistics); 758 free_percpu(net->mib.icmpv6_statistics); 759 kfree(net->mib.icmpv6msg_statistics); 760 } 761 762 static int __net_init inet6_net_init(struct net *net) 763 { 764 int err = 0; 765 766 net->ipv6.sysctl.bindv6only = 0; 767 net->ipv6.sysctl.icmpv6_time = 1*HZ; 768 net->ipv6.sysctl.flowlabel_consistency = 1; 769 net->ipv6.sysctl.auto_flowlabels = 0; 770 net->ipv6.sysctl.idgen_retries = 3; 771 net->ipv6.sysctl.idgen_delay = 1 * HZ; 772 net->ipv6.sysctl.flowlabel_state_ranges = 1; 773 atomic_set(&net->ipv6.fib6_sernum, 1); 774 775 err = ipv6_init_mibs(net); 776 if (err) 777 return err; 778 #ifdef CONFIG_PROC_FS 779 err = udp6_proc_init(net); 780 if (err) 781 goto out; 782 err = tcp6_proc_init(net); 783 if (err) 784 goto proc_tcp6_fail; 785 err = ac6_proc_init(net); 786 if (err) 787 goto proc_ac6_fail; 788 #endif 789 return err; 790 791 #ifdef CONFIG_PROC_FS 792 proc_ac6_fail: 793 tcp6_proc_exit(net); 794 proc_tcp6_fail: 795 udp6_proc_exit(net); 796 out: 797 ipv6_cleanup_mibs(net); 798 return err; 799 #endif 800 } 801 802 static void __net_exit inet6_net_exit(struct net *net) 803 { 804 #ifdef CONFIG_PROC_FS 805 udp6_proc_exit(net); 806 tcp6_proc_exit(net); 807 ac6_proc_exit(net); 808 #endif 809 ipv6_cleanup_mibs(net); 810 } 811 812 static struct pernet_operations inet6_net_ops = { 813 .init = inet6_net_init, 814 .exit = inet6_net_exit, 815 }; 816 817 static const struct ipv6_stub ipv6_stub_impl = { 818 .ipv6_sock_mc_join = ipv6_sock_mc_join, 819 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 820 .ipv6_dst_lookup = ip6_dst_lookup, 821 .udpv6_encap_enable = udpv6_encap_enable, 822 .ndisc_send_na = ndisc_send_na, 823 .nd_tbl = &nd_tbl, 824 }; 825 826 static int __init inet6_init(void) 827 { 828 struct list_head *r; 829 int err = 0; 830 831 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 832 833 /* Register the socket-side information for inet6_create. */ 834 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 835 INIT_LIST_HEAD(r); 836 837 if (disable_ipv6_mod) { 838 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 839 goto out; 840 } 841 842 err = proto_register(&tcpv6_prot, 1); 843 if (err) 844 goto out; 845 846 err = proto_register(&udpv6_prot, 1); 847 if (err) 848 goto out_unregister_tcp_proto; 849 850 err = proto_register(&udplitev6_prot, 1); 851 if (err) 852 goto out_unregister_udp_proto; 853 854 err = proto_register(&rawv6_prot, 1); 855 if (err) 856 goto out_unregister_udplite_proto; 857 858 err = proto_register(&pingv6_prot, 1); 859 if (err) 860 goto out_unregister_ping_proto; 861 862 /* We MUST register RAW sockets before we create the ICMP6, 863 * IGMP6, or NDISC control sockets. 864 */ 865 err = rawv6_init(); 866 if (err) 867 goto out_unregister_raw_proto; 868 869 /* Register the family here so that the init calls below will 870 * be able to create sockets. (?? is this dangerous ??) 871 */ 872 err = sock_register(&inet6_family_ops); 873 if (err) 874 goto out_sock_register_fail; 875 876 /* 877 * ipngwg API draft makes clear that the correct semantics 878 * for TCP and UDP is to consider one TCP and UDP instance 879 * in a host available by both INET and INET6 APIs and 880 * able to communicate via both network protocols. 881 */ 882 883 err = register_pernet_subsys(&inet6_net_ops); 884 if (err) 885 goto register_pernet_fail; 886 err = icmpv6_init(); 887 if (err) 888 goto icmp_fail; 889 err = ip6_mr_init(); 890 if (err) 891 goto ipmr_fail; 892 err = ndisc_init(); 893 if (err) 894 goto ndisc_fail; 895 err = igmp6_init(); 896 if (err) 897 goto igmp_fail; 898 899 ipv6_stub = &ipv6_stub_impl; 900 901 err = ipv6_netfilter_init(); 902 if (err) 903 goto netfilter_fail; 904 /* Create /proc/foo6 entries. */ 905 #ifdef CONFIG_PROC_FS 906 err = -ENOMEM; 907 if (raw6_proc_init()) 908 goto proc_raw6_fail; 909 if (udplite6_proc_init()) 910 goto proc_udplite6_fail; 911 if (ipv6_misc_proc_init()) 912 goto proc_misc6_fail; 913 if (if6_proc_init()) 914 goto proc_if6_fail; 915 #endif 916 err = ip6_route_init(); 917 if (err) 918 goto ip6_route_fail; 919 err = ndisc_late_init(); 920 if (err) 921 goto ndisc_late_fail; 922 err = ip6_flowlabel_init(); 923 if (err) 924 goto ip6_flowlabel_fail; 925 err = addrconf_init(); 926 if (err) 927 goto addrconf_fail; 928 929 /* Init v6 extension headers. */ 930 err = ipv6_exthdrs_init(); 931 if (err) 932 goto ipv6_exthdrs_fail; 933 934 err = ipv6_frag_init(); 935 if (err) 936 goto ipv6_frag_fail; 937 938 /* Init v6 transport protocols. */ 939 err = udpv6_init(); 940 if (err) 941 goto udpv6_fail; 942 943 err = udplitev6_init(); 944 if (err) 945 goto udplitev6_fail; 946 947 err = tcpv6_init(); 948 if (err) 949 goto tcpv6_fail; 950 951 err = ipv6_packet_init(); 952 if (err) 953 goto ipv6_packet_fail; 954 955 err = pingv6_init(); 956 if (err) 957 goto pingv6_fail; 958 959 #ifdef CONFIG_SYSCTL 960 err = ipv6_sysctl_register(); 961 if (err) 962 goto sysctl_fail; 963 #endif 964 out: 965 return err; 966 967 #ifdef CONFIG_SYSCTL 968 sysctl_fail: 969 pingv6_exit(); 970 #endif 971 pingv6_fail: 972 ipv6_packet_cleanup(); 973 ipv6_packet_fail: 974 tcpv6_exit(); 975 tcpv6_fail: 976 udplitev6_exit(); 977 udplitev6_fail: 978 udpv6_exit(); 979 udpv6_fail: 980 ipv6_frag_exit(); 981 ipv6_frag_fail: 982 ipv6_exthdrs_exit(); 983 ipv6_exthdrs_fail: 984 addrconf_cleanup(); 985 addrconf_fail: 986 ip6_flowlabel_cleanup(); 987 ip6_flowlabel_fail: 988 ndisc_late_cleanup(); 989 ndisc_late_fail: 990 ip6_route_cleanup(); 991 ip6_route_fail: 992 #ifdef CONFIG_PROC_FS 993 if6_proc_exit(); 994 proc_if6_fail: 995 ipv6_misc_proc_exit(); 996 proc_misc6_fail: 997 udplite6_proc_exit(); 998 proc_udplite6_fail: 999 raw6_proc_exit(); 1000 proc_raw6_fail: 1001 #endif 1002 ipv6_netfilter_fini(); 1003 netfilter_fail: 1004 igmp6_cleanup(); 1005 igmp_fail: 1006 ndisc_cleanup(); 1007 ndisc_fail: 1008 ip6_mr_cleanup(); 1009 ipmr_fail: 1010 icmpv6_cleanup(); 1011 icmp_fail: 1012 unregister_pernet_subsys(&inet6_net_ops); 1013 register_pernet_fail: 1014 sock_unregister(PF_INET6); 1015 rtnl_unregister_all(PF_INET6); 1016 out_sock_register_fail: 1017 rawv6_exit(); 1018 out_unregister_ping_proto: 1019 proto_unregister(&pingv6_prot); 1020 out_unregister_raw_proto: 1021 proto_unregister(&rawv6_prot); 1022 out_unregister_udplite_proto: 1023 proto_unregister(&udplitev6_prot); 1024 out_unregister_udp_proto: 1025 proto_unregister(&udpv6_prot); 1026 out_unregister_tcp_proto: 1027 proto_unregister(&tcpv6_prot); 1028 goto out; 1029 } 1030 module_init(inet6_init); 1031 1032 MODULE_ALIAS_NETPROTO(PF_INET6); 1033